Here are some "nerves-on" activities to help your students understand the nervous system.

Acting Potential: How
fast can a message travel? Could your nerves communicate as fast
as a telegraph wire or a cell phone? It may depend upon what you
are asking them to do.
:: View activity

Reach Out and Touch Someone:Shut
your eyes. What can you feel? Sensations are your brain's interpretation
of signals it receives from your skin. Here's a simple exploration
you can do to measure your sense of touch.
:: View activity

Caffiene Critters: The environment challenges each living
thing to react. You can explore the effects
of some chemicals using a simple organism called a Daphnia.
:: View activity